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Exam 2: One-Dimensional Kinematics

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Question 71

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A train starts from rest and accelerates uniformly until it has traveled 5.6 km and acquired a forward velocity of 42 m/s. The train then moves at a constant velocity of 42 m/s. For 420 s.The train then slows down uniformly at 0.065 m/s². Until it is brought to a halt.The acceleration during the first 5.6 km of travel is closest to which of the following?

A) 0.16 m/
B) 0.14 m/
C) 0.17 m/
D) 0.19 m/
E) 0.20 m/

F) A) and B)
G) A) and C)

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Question 72

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An astronaut stands by the rim of a crater on the Moon,where the acceleration of gravity is 1.62 m/s² and there is no air.To determine the depth of the crater,she drops a rock and measures the time it takes for it to hit the bottom.If the time is 6.3 s,what is the depth of the crater?

A) 10 m
B) 14 m
C) 26 m
D) 32 m
E) 38 m

F) D) and E)
G) B) and C)

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Question 73

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From the edge of a roof top you toss a green ball upwards with initial speed v₀ and a blue ball downwards with the same initial speed.Air resistance is negligible.When they reach the ground below

A runner runs around a track consisting of two parallel lines 96 m long connected at the ends by two semicircles with a radius of 49 m.She completes one lap in 100 seconds.What is her average speed?

To determine the height of a bridge above the water,a person drops a stone and measures the time it takes for it to hit the water.If the time is 2.3 s,what is the height of the bridge? Neglect air resistance.

An airplane increases its speed at the average rate of 15 m/s².How much time does it take to increase its speed from 100 m/s to 160 m/s?

A car starts from rest and accelerates at a steady 6.00 m/s².How far does it travel in the first 3.00 s?

Suppose that an object is moving with a constant velocity.Which statement concerning its acceleration must be correct?

A stone is thrown with an initial upward velocity of 7.0 m/s and experiences negligible air resistance.If we take upward as the positive direction,what is the velocity of the stone after 0.50 s?

A car is moving with a speed of 32.0 m/s.The driver sees an accident ahead and slams on the brakes,causing the car to slow down with a uniform acceleration of magnitude 3.50 m/s².How far does the car travel after the driver put on the brakes until it comes to a stop?

Suppose that an object travels from one point in space to another.Make a comparison between the magnitude of the displacement and the distance traveled by this object.

Car A is traveling at 22.0 m/s and car B at 29.0 m/s.Car A is 300 m behind car B when the driver of car A accelerates his car with a uniform forward acceleration of 2.40 m/s². How long after car A begins to accelerate does it take car A to overtake car B?

Car A is traveling at twice the speed of car B.They both hit the brakes at the same time and decrease their velocities at the same rate.If car B travels a distance D before stopping,how far does car A travel before stopping?

A train starts from rest and accelerates uniformly until it has traveled 2.1 km and acquired a forward velocity of 24 m/s. The train then moves at a constant velocity of 24 m/s. For 400 s.The train then slows down uniformly at 0.065m/s². Until it is brought to a halt.The distance traveled by the train while slowing down is closest to

A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min.What was the average speed of the runner in m/s?

Starting from rest,a dragster travels a straight 1/4 mi racetrack in 6.70 s with constant acceleration.What is its velocity when it crosses the finish line?

A toy rocket is launched vertically from ground level at time t = 0 s.The rocket engine provides constant upward acceleration during the burn phase.At the instant of engine burnout,the rocket has risen to 49.0 m and acquired an upward velocity of 60.0 m/s. The rocket continues to rise with insignificant air resistance in unpowered flight,reaches maximum height,and falls back to the ground.The maximum height reached by the rocket is closest to

Which of the following graphs represent an object at rest? (There could be more than one correct choice. )